I tried to compile and install the sample HelloCreativeSDK that comes with the SDK, and, after copying it to the extension directory, the extension appears in the extensions menu, but after clicking on it in Photoshop CS5 an empty panel appears.

If I try to create a new extension from scratch with only a label, the panel is empty too.

If I try to load the extension in Illustrator or Fireworks, the panel doesn't appear; in Photoshop the panel appears, but it is empty (it should contain a test label instead).

Kuler and others default extensions are working fine.

Nothing appears in the logs mentioned in the SDK Guide. What am I doing wrong?

I am wondering- maybe the debug mode (for StageManager) is not set? A blank panel suggests maybe the StageManager is not loading your extension SWF- the container is being created (a platform window) but no SWF being loaded See http://my.adobe.acrobat.com/p48386410/ and scrub to 19 min 30 seconds or thereabouts for an example of setting the debug mode (in Mac OS at least, on Windows it would be a registry setting).

The StageManager component in Creative Suite CS5 applications that loads extension SWFs will not load in 'release' model unsigned extensions- the exception is when the StageManager component is initialized in debug mode (by setting the player debug mode flag as above).

When using Extension Builder, this is handled by the tooling and is transparent to the developer. However, if using CS SDK directly, then I believe you need to perform this manually.